Uh... Beastboy monkey looked perplexed as the barrage of questions came his way. Let's go one at a time...

He put a finger to his chin thinking, Have you ever seen a boat? Stacy is like a boat. We're all on her...but she's alive and totally aware we're here. And she scooped us all up and now we're sailing through...the stars. He grinned hopefully that the explanation had satisfied.

I come from Earth, but it might not be your Earth...like. There are lots of different versions of Earth if that makes sense?

And finally he hung his head a little and his shoulders slumped, Y-yeah...it is. B-but don't worry! Stacy saves there's a chance we can get it back! Everyone and everything safe and sound. That was always the hardest part to tell.